package org.zhadoop.stream.cql.semanticanalyzer.parser.context;

import java.util.List;

import org.zhadoop.stream.cql.DriverContext;
import org.zhadoop.stream.cql.exception.CQLException;
import org.zhadoop.stream.cql.exception.SemanticAnalyzerException;
import org.zhadoop.stream.cql.hooks.SemanticAnalyzeHook;
import org.zhadoop.stream.cql.semanticanalyzer.SemanticAnalyzer;
import org.zhadoop.stream.cql.semanticanalyzer.parsecontextwalker.ParseContextWalker;
import org.zhadoop.stream.cql.tasks.Task;

import com.google.common.base.Joiner;
import com.google.common.collect.Lists;

/**
 * combine 条件语法解析内容
 * @author zwd
 *
 */
public class CombineConditionContext extends ParseContext{
	
	private List<ExpressionContext> combineExpressions;
	
	public CombineConditionContext() {
		combineExpressions = Lists.newArrayList();
	}
	
	@Override
	public String toString() {
		return "COMBINE (" + Joiner.on(", ").join(combineExpressions) + ")";
	}
	
	public List<ExpressionContext> getCombineExpressions() {
		return combineExpressions;
	}

	public void setCombineExpressions(List<ExpressionContext> combineExpressions) {
		this.combineExpressions = combineExpressions;
	}

	@Override
	public Task createTask(DriverContext driverContext, List<SemanticAnalyzeHook> analyzeHooks) throws CQLException {
		return null;
	}

	@Override
	public SemanticAnalyzer createAnalyzer() throws SemanticAnalyzerException {
		return null;
	}

	@Override
	protected void walkChild(ParseContextWalker walker) {
		for(ExpressionContext exp : combineExpressions){
			walkExpression(walker, exp);
		}
	}

}
